Machine for cutting embroidery



A. TSCHERNE.

MACHINE FOR CUTTING EMBROIDERY.

APPLICATION FILED SEPT. a, 1919.

fig. 2 7 ,j,

2 SHEETS-SHEET I.

Patented Nov. 23, 1920.

A. TSCHERNE.

MACHiNE FOR CUTTING EMBROIDERY.

APPLICATION FILED SEPT. 3, 1919.

2 9 2 SHEETS-SHEET 2 I 67 J9 f6 T i fi 2 I1".

Patnted Nov. 23, 1920.-

- 'rssrr To all whomz't may concern:

1 lates more particularly'to a machine having Bait known'that I, YALOISTsorrnnnn', a citizen of the Swiss Confederation, andresiding atRorschach, Switzerland, have. in vented certain. new and usefulImprovements inllilachines for Cutting'Embroidery, of which thefollowing is a specification.

The present invention has reference to certain new and.usefulimp'rovem'ents in machines for'cutting embroidery, and it retwo.superposed revoluble disk knives for cutting the fabric along the edgeof. embroidery and means n connection with the fabric feeding mechanismfor so controlling the fabric feed that it is dependent upon thedirection of the embroidery edge, malt ing thereby the feed elastic inkeeping with the cutting resistance and speed, an arrangement whicheffectively protects fabric and embroidery against injury. 7 V

My invention will best be understood when described in connection withthe accompanying drawings, in which Figure 1 is a front elevation of thenew cutting ma chine, with parts in section or broken away; Fig. 2 1s atop View wlth the work table re moved; Fig. 8 1s a side View; Fig. 4crepresents a plan of a part of themachine; Fig.

5 is a side view of Fig. a; Fig. 6 shows a detail, of which Fig. 6?shows a partial plan, and. Fig. 7 illustrates diagrammatically theoperation of the machine. 7 j

From the bed plate 1 ri'sesthe standard 2 supporting sleeves 3 andt inwhich are re spectively journal-ed. the shafts 7 and 8 to spectively,the one of which isfixed to the shaft 11 and the otherone of which turnsloosely on thisshaft, which latter is rota-.

tably journal'ed in the bearings 9 and 10 respectively. The shaft 11'isdriven in any suitable manner over its fixed pulley 1 5, for

instance by a not shown electromotor or other source of power. Theknives 5 and 6 are in the shape of cooperating, rotatable, disk-likeedge tools, and are] so arranged that they partially overlap, so thattheir -ALOIS 'rsorrnnnn or 'nonsoneon, swrrznntann jMAGI-IINE FORouirrmsfnmnnoinnnx; Q 3' 'Application filed $epteniber'3Q1919 s rialnodsa n' 's,

planes'S an'd 6 meet at a pointa theirperip'heries-th'en constituting acutting races, the ,wdrk "able T 'o r c th f piece to'becut is f -1' v iI I i Specification of Letters late'nt. iPfltbfin'bd devi'ce in themanner of rotary. shears; F The point of contact Zz-',the-.f uttingpoint} From the support sleeves 3 l res'p ec tively extend brackets 3"(Figl 'l'fand f (Fig. 5) which support guideior; gate mem-' bers 16 andli? respectively, which form be tween them "immediately in front offabric intake'or cutting point a't'he intake 7 slit or gate E 2 and 4E)which isv er} tically directed relative to the middle plane "of theknives and which is designed to, ad

mit solely the ground fabric but not the embroidery portion, so that theknives can act only on the fabric but not on the em)- broidery edge. Thegate'member '16'is rigid, while themember v17 can be horizontallysecurably displaced insuitable' manner, so 1 that the width'of the gateE can be adjust-ed to fit any thickness of fabric.

F01?advwflciltgv the fabric there area-rranged two pairsof rollers 19,20 (Fig 1 and 2) and 21, 22" (Figs. andft), the former roller pairserving for drawing down the wasteportion' the latter for acting on theembroidered portion. The roller pair 19, 20 is driven by means of a worm23"fastontheshaft 11,'which meshes with a worm-wheel 24 fast on ashaft'26 which is journaledin the bearing sleevef25- (Fig. 2).""1 Thisshaft: 26 also carries the driving wheel 27 which meshes with thedriving 'wheel 28'fast ontheroller shaft 19". on thefshaft26 rideslooselythe outrigger member 29 with cross-sleeve 30, in

latter the one end" of the shaft19' is journaled'. Thei outriggjerfurther is pror' vided with a downcranked arm 29 (Fig. 1) to which ispivotally 'se'curedthe lever 31 journaling the shaft 20, of the roller20.

The. two rollers thus can rock aboutathe,

shaft 26. Thespring32 acting on the upper end of the lever B'Ltends topress the roller 20 against the roller 19, and both rollers can rotatefreely. The roller 19 is "arranged between the fixed disk 33 (Fig. 2and. the axially shiftable pressure disk 34:, whichis secured to thenarrow sleeve 37 supporte'djon the fork. member 35 and is adapted 'tdbe[axially displaced"onthe sha ft 19 against the action of a spring 36.According as this spring 36 forces the sleev'e and thus against therigid disk33, and thus the rollerwill be rotated at a correspondinglygreater or lesser speed, all of which is caused by the more or lesspronounced pressure of the 1 fabricagainst the gate members 16 and 17.

The fork 35 is pivoted. to a lever arm 38 -which is rockingly supportedby means of pivot screws 40 in a support member 39. T hlS latter isrotatlngly ournaled by its trunn1on 41 in an upstanding bearing member 12, the whole presenting a kindof universal joint which permits of therocking i5" axis of arm 38 assuming different angular positionsrelativeto the horizontal. this relative angular displacement the lever 38 andthe fork 35 linked thereto can be subjected to"lateral displacementsothat onthe lever 38 with its roller 19 swinging up.- wardly, the fork 35will swing outwardly, which for .es the sleeve '37 and thus the pressuredisk 341 away from the roller against the action of the spring 36,-andon the lever 38 with the roller swinging down into the lowermostposition fixed by a stop 30, the fork will swing inwardly, allowing thespring to press the pressure disk 34 against the roller 19. Thus on theroller swinging up there will be a corresponding retardation in itsrotary speed. The roller 19 also can be arrested completely when theascending end K of the edge of the embroidery, for instance a festoon F(Fig. 7) is drawn against the gate members 16 and 17 and is about to becut, when, owing to the resistance occasioned by the edge, there isdanger of the fabric being torn. But this danger is efl'etivelyneutralized by the reduction of the feed speed or the momentary arrestof the rollers, when the pull on the .fabric is correspondingly eased,the latter always being held under a tension corresponding to theobtaining resistance.

This arrangement serves to automatically control the feed ofthe workpiece through betweentheroller pairs 19, 20 and 21, 22,

by so regulating the actuation of thelatter under the influence of theresistance opposed to thec'uttingbytheembroidery edge, that the rollersalternately cause the one'or the other. fabric portion to act more orless forcibly against the gate members or the knives respectively, sothat the embroidery is alwaysdrawn through the knives with themomentarily required degree of pull.

This pull, obviously, must be weak when the ascending end of theembroidery edge K is being cut, and it is caused by the rollers 19, 20;it is to be strong when the descendino' ed 'e K" is bein severed, in

a .WhlCh instance the. roller pair 21,22 1s pulling. To a pin43extending from the outrigger 29 (Fig. 5) is secured one end of thespring .44 whose other end is secured to. a screw stud which issupported in an upstanding arm 47 and can 'be relatively adjusted by theset screw 455, this spring thenv regulating the swing-movement of theroller pair The roller pair 21, 22 is driven fromthe shaft 26 by meansof the bevel gears''ES, 48

(Fig. 3) ,e9, C0, 51 and 52 (Fig) 2). The wheel 52 is fast on the shaftMas is also: a couplingv member 53, while the comple mental couplingmember 55 and the roller driving wheel ride loosely on this shaft 54..with capability of axial displacement thereon. On the roller 21, whichis arranged {in abovethe shaft 54, there is provided a wheel 57 whichmeshes with the wheel 56 (Fig. 3). The roller 22 is located abovetheroller 21 and is frictionally taken along thereby, as is also the casewith the-rollers 19 and 20. The roller22 is journaled on trunnions in aframe or yokem'ember 58 (Fig. 3) which by means of a pin 59 is pivotallysuspended from a bracket member 61, which latter is hinged to a fixedmachine part and can readily be laidove'r. a. v The couplingmember 55 isconnected to an annular slide '62 with which'cooperates a fork 63 fixedon the one end of a shaft 66 which is rotatably journaled in the bearings 64 and 65. The other end of'the shaft 66 carries a lever 67 towhich is secured the one end of a draw rod 68 (Fig. 3), whose 7 otherend is connected to a pin 69 secured to an arm 70 extending from theoutrigger member 29, the draw rod being connected to the lever 67 and tothe pin 69-by the intermediary of ball and socket joints. By thisconnection the function of the roller pair 21, 22 is made interdependentwith that and on the roller 19 swinging downwardly the roller 21 will beuncoupled and arrested.

If now the work piece S, into which a small incision is previously madeby hand, is led through between the gatejmembers 16, 17 against theknives 5, 6,,th'e waste portion S being fed in between the rollers 19,20 and the'embroidered portion S between the rollers 21', 22, there willbe exerted a pull on the portion S by the ascendinge'mbroidery edge K ofthe festoon F (Fig. 7) offering relative strong resistance'to thecutting, with the result that the' roller pair 19 20 will swingupwardly. As a consequence the coupling members for the r0ller'21'areactuated which causes'the rollers 21 and 22 1 25 to rotate and draw tautthe fabric portion S, while by reasonof the braking action exerted byspring 36 ou the upswinging roller 19, the roller'pair 19,. 20 rotatesmore slowly, which means a lessened pull on the fabric portion S". Thefabric is drawn against the knives by the roller pair 21, 22 until thedescending edge K of the embroidery is about to be cut, the resistanceoffered by the edge being low and only a correspondingly weak pull beingexerted on the fabric portion S, so that the roller pair 19, 2O swingsdown, when simultaneously the roller pair 21, 22 will be uncoupled andthe fabric is once more drawn up against the knives by the nowspeedingup roller 7 pair 19, 20 until the ascending edge K of thesucceeding festoon Fcontacts with the knives. .T he control of theroller drive, thus,

always depends upon the direction of the embroidery edge just being cut,with the conformation of the latter being immaterial since the describedchange can be repeated over and over. 7

What I claim is v 1. In a machine for cutting fabric along anembroidered edge, a pair of partly overlapping, oppositely revolubledisk knives arranged to cut the fabric, feed rollers for the fabric,andmeans in connection with said disk knives for controlling theoperation of said feed rollers in accordance with the varying cuttingresistance.

' 2. In a machine for cutting fabric along an embroidered edge,superimposed oppositely revoluble disk knives partly overlapping oneanother in close contact with their peripheries forming a cutting point,

relatively adjustable gate members in front of the cutting point andforming an intake slit for the ground fabric, rollers for automaticallycontrollably feeding the work piece, means for interdependentlyactuating said rollers in accordance with the varying degree ofresistanceoffered tosaid cutting knives by the work material. i

3. In a machine for cutting fabric-along an embroidered edge, 'twosuperimposed op positely revoluble disk knives coacting to I form acutting point, pairs of rollersjfor.

feeding thework piece to the cutter, one of g V cordance with thevarying degree of resistance offered to said cuttingknives bythe workmaterial, an outrigger member on said pairs being mounted in front andthe I other back of said-cutter, means for inter-o 4 dependentlyactuating said rollers in acwhich thefront pairs of .rollersis mounted,1'

a shaft on which the outrigger member is journaled, and a driving-gearon said shaft whereby the outrigger member may swing A about said shaft,7 1

4. In a machine for cutting fabric along:

an embroidered edge, two superimposed oppositely revoluble disk knivescoacting to form a cutting point, pairs of rollers for feeding the workpiece to the cutter, one of 7 said pairs being mounted in front and theo other back of said cutter, means for; inter-.

on one of the said front rollers, and anobliquely journaled andlaterally displace-1 able leader arm operatively connected to said s rinp g ALOIS TSCHERNE.

